"Oh Shit" moments...

Worst "oh shit moment" I've had in a long long time today. Riding brakeless down a fairly decent hill, strava reckons I was doing 46mph (seems about right) when I hit a fucking massive pothole, I have no idea how I stayed on but my chain didn't..... I'd been playing around with my gearing and obviously hasn't tightened the chain enough. I haven't had it happen since I first started riding fixed and had no idea what I was doing (obviously evidence that I still don't). I assumed it would be a repeat of when my chain came off years ago and I'd get a nice mouthful of tarmac and a nice trip to A+E but luckily the chain just dragged along the ground rather than getting jammed in the rear wheel and I rolled to a stop well over half a mile down the road. So stupid and I have nobody to blame but myself for what could have been a really dangerous situation. I know it was completely preventable but it's made me seriously reconsider whether or not I should be riding brakeless.

It's made you seriously consider? And what was the conclusion?

Also, I ride 48:18 and once hit 38mph - I thought my legs were going to come off.